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In reply toI think he's brilliant, knows his stuff so well and is well able to break it down and sum it up
I bought one of his books tho and got lost

He knows his physics, but he obviously knows fuck all about the Mayan calander.
Does anyone?
Thats the point.

there are many interpretations. All he says in this video is that they used to count differently, so it must be wrong.

Yeah, he knows for a fact that they counted their fingers and toes to decide to count base 20 and then some how that also means that they have a last number hence the end of the calendar. If they used anything other than base 20 then the counting system would have no end, just like us with base 10 (because we have 5 fingers on our right hand and 5 toes on our right foot - fact), there is no last number, it goes on for infinity meaning that the modern day calendar accurately suggests no end to the planet.